(noun) The after-effect when one plays Guitar Hero for a prolonged period of time, the result of which is that for a few minutes after playing stops, everything seen appears to strech vertically outward. This is most likely caused by long hours staring at the fret board onscreen needed to see which notes to play.

After Trogdor-Cat and Bob pulled an all-nighter playing Guitar Hero II against each other, they both experienced severe attacks of fretchy syndrome.